Is it racist or am I overreacting?

For context I'm afrocolombian, so obviously I'm not white lol

I posted something saying like "WTF with white people denying they're white???" referring to those people that are obviously white but try really hard to deny it and someone basically said I'm one of those people, I don't even know that person tbh and all the pictures I post I have filters on that make my skin seem lighter but you can still see I'm not white

To be honest it felt kinda racist because that person was basically denying my ethnicity and with that all the racism I've experienced through my life, but I don't know if maybe I'm exagerating and it's not that big of a deal (?

-Matthew